I've found it hard to figure out what CA correction to apply. CA is most visible beyond the center so any correction to address that area makes the center worse. So I pick a mid-point that at best only makes a small improvement.

I could never work out CA corrections satisfactorily when I was using Aperture but Lightroom has automatic CA correction, just tick a box, and only a slightly more complex correction process for purple and/or green fringing. That was one of the reasons I decided to swap to Lightroom.

I could never work out CA corrections satisfactorily when I was using Aperture but Lightroom has automatic CA correction, just tick a box, and only a slightly more complex correction process for purple and/or green fringing. That was one of the reasons I decided to swap to Lightroom.

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Yes, Aperture has fallen behind. Does the auto CA correction in LR fix uneven CA from center to edge?

Yes, Lightroom is very good at correcting CA. I use a 300mm legacy lens that produces a fair amount of CA in the right conditions, and I can always get them taken care of in Lightroom.

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Same here for my Canon FD 400mm w/ Aperture. CA correction is easy for that one & there's lots of it to correct.

The CA correction for the 12mm @ f2 doesn't work as well. Maybe it is chromatic coma at the edges that I'm having trouble with. It has the same look & the 12 does have about the same amount of overall coma. Its most visible in star photos which of course I shoot @ f2. I can easily correct CA in the center but left w/ something else at the edges.

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